Definition of grapefruit noun from the Oxford Advanced Learner's Dictionary

 

grapefruit

 noun
noun
BrE BrE//ˈɡreɪpfruːt//
 
; NAmE NAmE//ˈɡreɪpfruːt//
 
(pl. grapefruit, grapefruits)[countable, uncountable] Fruit
 
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a large round yellow citrus fruit with a lot of slightly sour juice See related entries: Fruit Word Origin early 19th cent.: from grape + fruit (probably because the fruits grow in clusters).
See the Oxford Advanced American Dictionary entry: grapefruit